1£®Though lacking (lack) money and support from his family, he managed to complete the task in advance, which I think is due to his strong confidence (confident) and determination.

2£®Could you do me a favour to check my application(apply) form? I want to guarantee not to leave out any important information.

3£®He was a successful(success) figure in the field, but he had a virtue of modesty (modest) and never liked showing off.

4£®Although the conversation was informal (formal), you should have attended it on time.I think you should make an apology(apologise) for your absence (absent)£®

5£®He was very cautious about the job interview, because he was aware of the fact that certain opportunities(opportunity), once lost, can never return.